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  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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    <script>
      // 遍历数组的新方法 forEach
      var arr = [1, 2, 3, 4];
      arr.forEach(function (val, i) {
        console.log(val); // 数组中的所有值
        console.log(i); // 数组的索引号
      });
    </script>
  </body>
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